Mold for forming concrete receptacles.



PATENTBD SEPT. 5, 1906.

M5 2 SHEETS-SHEET 1.

J. A. JOHNSON. MOLD PON FORMINO CONCRETE REOBPTAOLBS.

APPLICATION FILED AUG. 30,1904.

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A5. 03m/mw E 4 s s e JOHN A. JOHNSON, OF GREENFIELD, INDIANA.

MOLD FOR FORIVHNG CONCRETE RECEPTACLES.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed August 30, 1904. Serial No. 222,743.

T0 (l/ZZ whomr t may concern:

Be it known that I, JOHN A. JOHNSON, a citi- Zen of the United States, residing at Greentield, in the county of Hancock and State ot' Indiana, have invented certain new and useful Improvements in Molds for Forming Concrete Receptacles, of which the following is a speciiication.

This invention relates to improvements in molds for forming burial vaults, watertroughs, milk-troughs, and other similar receptacles out of cement and sand; and the object is to provide a. mold that can be adjusted in length and width to make receptacles of dit'- ferent dimensions.

The object also is to provide amold that can be assembled b v few assistants and removed after the receptable is formed without danger of breaking` or marring the g'reen cement, and the object is to construct the mold so as to produce a smoothly-finished product.

I accomplish these objects by the mechanism illustrated in the accompanying' drawings, in which- Figure l is a top plan view ot' my complete mold in its operative position; Fig. 2, a vertical section of same on the line 2 2 of Fig. l', Fig. 3, a vertical cross-section on the line 3 3 of Fig. l, and Fig. 4 an end elevation 'of the mold.

Like characters of reference indicate like parts throughout the several views of the drawings.

The outside of the mold is composed ot' the rigid corner-sections 1 and the intermediate removable sections E2, which latter are of various widths to enable the length and width of the mold to be changed to suit the dimensions ofthe particular receptacle to be molded. The dividing-lines between the sections run transversely of the mold, and each of the resultant vertical sections 2 has a threaded bolt 3 adjacent to each end. The several sections 9. at each side and end ot' the mold are joined together and to their respective ends l by means ot' the bars 4, which have longitudinal slots 5, through which the bolts 3 are passed. The several parts are locked together by screwing up the nuts 6 on the threaded bolts 3.' The ends l and intermediate sections 2 will all preferably be dividedon the horizontal plane through the joints 7, whereby oblique upper sections 8. as shown in the drawings, may be placed upon the lower sections in order to widen the concrete product, such as burialvaults, at the top to make room for a rectangular groove or rabbet to receive the lid. For water-troughs, milk -troughs, and the like where this rabbet is not desired the oblique members of the mold are removed and straight ones con forming with the lower members are substituted. Each of the top members will be provided with a metal dowel-pin 9, which enters a socket l() in its lower member. The latter is preferably made from a metal strap or plate with a half-round middle bend, from which take flanges that are riveted or bolted to the mold-section. The dowel and its socket are set in so as te be below the outer Atace of the mold to prevent interference with the bars i.

The bars 11 ll are laid across the outside mold above described, and from these bars the inside mold is suspended by means of the bolt-hooks l2. The inner mold is considerably smaller than the outer mold, and the space between the two will be lilled with concrete to produce the side and end walls of the concrete box. The side and end walls of this inner mold are united at the corners ot' the latter in a lixed manner; but between said corners the walls are divided transversely to form four right-angle corner-pieces 13, which are movable to and from each other to change the dimensions of the said inner mold. A given adjustment of the several sections is held by the bars 14e, which are secured thereto by means ot' the bolts 15, having the wingnuts 1G. These bars will be provided with longitudinal slots to receive the bolts and allow adjustment et' the mold-sections without removing the bolts. The space between the ends of the corner-pieces 13 will be lilled with the vertical sections 1T, which will be held by similar bolts l5 with nuts 16. The divided parts ot' the mold at the sides and ends will always be separated by at least one removable section, whereby by its withdrawal after the concrete walls have been formed and have become set the inner mold may be contracted for easy removal. The middle member of the removable sections will be the one that will always be present Vfor all sizes ot' the mold, and it will have its edges oblique where they join with the adjacent sections. rlheir slope will be toward each other from rear to front to make an outwardly-taperng wedge formation, and this wedge-shape section will contact with the correspondingly-sloped edges ot' the adjacent members of the mold by the outward movement of said middle section, thereby tightening up the several parts. This outlOO IIO

ward movement is obtained by means of the set-screws 18, which are screwed through bars 14 against'said middle sections, as shown in Fig. 1. The bars 14 are notched at 19 to make room for the easy insertion and removal of said middle section. It will also be noted by examination of Figs. 2 and 3 that the walls of the inner mold are oblique to facilitate the withdrawal of the mold after the concrete is molded and also to increase the thickness and strength of the walls of the box at the bottom and make the expansion easier in case of freezing of the liquid contents of the box to thereby lessen the danger of breakage due to that cause.

vrlhe surfaces of all of the parts of the inner and outer molds will be covered with sheet metal 2O where they will contact with the concrete-work, so as to make a smoother finish on the concrete surfaces than would obtain from contact with mold-surfaces of wood. These metal coverings extend into the joints to cover the edges of the sections, as shown in the drawings.

The operation and preferred use of my improved mold are as follows: The outside mold; adjusted by means of the removable sections to the required size, is placed on a level surface and the wooden strips 2l are laid against the inside of the mold. The height of these strips gage the thickness of the bottom, concrete for which is deposited in the mold between said strips until the tops of the strips are reached. Then the strips are withdrawn, which is easily done with the trowel, whereupon the inner mold, which has been previously adjusted to the desired size, is hoisted by means of rope and tackle and a derrick high enough to clear the top of the outer mold and is then deposited therein in propell position, where it is suspended by means of the hooks 12 from the bars 11. The bars 11 are laid across the outer mold and are supported thereon,- and the hooks 12 are caught under the bars 14. Vhen the inner mold is in position, the space all around between the two molds is filled in with the concrete, and by entering the space previously occupied by the strips 21 a good joint is made between the walls and the bottom, and no joint at all is shown in the outer wall,where it would otherwise be sure to be noticeable. Just before the top of the wall is finished out the Wooden strips 23 are laid in place against the inner mold to form a rabbet to receive the lid of the box. When the concrete structure has become set and dry enough to stand alone, the inner mold is removed by first loosening and taking out the middle or key sections, which allows the walls to be shortened enough to permit the mold to be drawn out without injuring the concrete. In making shallower troughs or boxes, like watering-troughs, milkboxes, and the like, the top members 8 of the outer mold will be left off, the bars 11 being and supported from said bars, said removable strip having outwardly-sloping edges, and the adjacent parts thereto having correspondingly-obliqued edges.

2. In a mold for forming concrete receptacles, a removable middle portion in a plurality of separable parts, a middle member in each series of removable sections having oblique outwardly-tapering edges, and the adjacent sections thereto having oblique edges of the same slope as the adjacent edge of said middle member.

3. In a mold for forming concrete receptacles, a removable middle portion in a plurality of separable parts, horizontal bars secured to the inner sides of each series of said separable parts, a middle member in each series of removable sections having oblique outwardly tapering edges, adjacent sections thereto having oblique edges of the same slope as the adjacent edge of said middle member, and means operated from the horizontal bars for moving said middle member in an outward direction.

4. In a mold for forming concrete receptacles, a removable middle portion in a plurality of separable parts, a middle member in each vseries of removable sections having oblique outwardly-tapering edges, adjacent sections thereto having oblique edges of the same slope as the adjacent edge of. said middle member, horizontal bars secured to the inner sides of each series of said separable parts being notched to allow for the easy insertion of said middle member, and set-screws through the bars against the middle members to force the latter in an outward direction.

5. In a mold for forming concrete receptacles, an outside mold in a plurality of trans- TOO ITO

versely-divided Vparts whereby the dimensions of the mold may be changed, said mold being used on a plane surface, temporary gage-bars Versely-dvic'led parts, a middle member in l joints so as to cover the edges of said sections. IO each series of removable sections having ob- In witness whereof I have hereunto set my lique outwardly-tapering edges and the adjahand and seal, at Indianapolis, lndiana, this cent edges thereto having oblique edges of 24th day of August, A. D. 1904.

the same slope as the adjacent edge of said w l middle members, and a. sheet-metal covering JOHN A JOHNbON' [L' S] for all of the surfaces of both inner and outer molds that Contact with the cement, said sheetmetal coverings being continued into the Witnesses:

J osEPH A. MINTURN, F. W. WOERNER. 

